In this study, 35 male athlete students (age: 15.17 ± 1.62 years height: 170.11 ± 8.19 cm) were voluntarily recruited. Participantsīased on our understanding, previous studies recruited between 7 and 31 participants and 21 participants was the biggest sample size for repeated measures. The findings would also be valued for sports events managers to reconsider their planning on competition time especially for the events involving endurance activities, such as a marathon run.ģ. Sports trainers would benefit from the findings by adjusting their training plan to fit the best timing in a day for cardiovascular endurance training. The aim of this study is to find out the diurnal variation in cardiovascular endurance performance. The purpose of this study was to find out the diurnal variation in cardiovascular endurance performance in the young athletes.ĭue to the complicated implementation, such as control of environmental factors, energy depletion, and hyperthermic fatigue ( 15), there were limited studies on the diurnal effect for endurance exercise. The best single measure of young people’s aerobic fitness, VO 2max ( 13) is an essential pre-requisite of elite performance in many sports ( 14), so the understanding of VO 2max performance in varied time-of-day specific occasions for young athletes would be very important to identify the best training time or performing time. Their circadian rhythms are more regular than the usual target participants (i.e. The target participants of this study were secondary school athletes. Previous studies focused on investigating the diurnal effect on collegiate students and adult-athletes, but rarely had discussion and examination on young athletes or secondary school athlete students. Greatest VO 2max/ Performance in Time of Dayġ4 Physically active males Age: 22.3 ± 6.2 yearsĩ Recreational volunteers 6 Male 3 Female Age: 25 ± 8 yearsġ2 Healthy sedentary males Age: 30 yearsġ1 Male competitive cyclists Age: 19.1 ± 1.8 yearsħ Male collegiate swimmers Age: 22 ± 4 yearsĢ7 College students 7 Male 20 Female Age: 26 ± 4 yearsġ5 Male soccer players Age: 17.3 ± 0.5 yearsĪ Abbreviations: F, field test L, laboratory-based test Max, maximal Sub-max, submaximal VO 2max, maximal oxygen uptake. Thus, the diurnal variation in cardiovascular endurance performance is still unclear. However, most studies ( 6- 10) indicated that the VO 2max is a stable function, which is not altered by diurnal changes. ( 3) found that VO 2max is significantly greater in the morning, but other studies found that greater VO 2max performance is achieved in the afternoon ( 4, 5). Previous findings of diurnal effect on maximal oxygen uptake (VO 2max) were not reached to the consensus. Many researchers have investigated in the diurnal effect on endurance activities since 1980s ( Table 1). Regarding circadian effect on aerobic exercise and maximal oxygen uptake (VO 2max) shown in Chtourou et al. By the same token, the body-clock is believed to be a factor affecting sports performance. These responses are related to the circadian rhythm (i.e. Backgroundīody responses are varied from time to time in a day due to specific body conditions such as wakefulness, hunger, jet lag, etc. Secondary school students or young athletes are recommended to have sports training related to VO 2max at noon for the purpose of maximizing training effectiveness.Ĭircadian Rhythm Aerobic Exercise Diurnal Effect Oxygen Athlete Students 1. Diurnal effect on endurance performance was found and the highest exercise VO 2max was identified at noon.
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